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Contains:  NGC 660
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Polar Ring Galaxy NGC 660, 





    
        

            George Simon
Polar Ring Galaxy NGC 660

Polar Ring Galaxy NGC 660

Technical card

Imaging telescope or lens:TPO/GSO 6" f/6 Imaging Newtonian

Imaging camera:Canon 1100D

Mount:Sky-Watcher EQ-6 Pro

Guiding telescope or lens:ORION Mini guide 50mm

Guiding camera:ORION SSAG

Software:GIMP 2.9.6Backyard EOS 3.1.16PHD2.6.4dev3Nebulosity 3.3.3Startools 1.3.5.289

Accessory:Baader MPCC

Resolution: 1330x842

Dates:Oct. 17, 2017

Frames: 140x90" ISO800

Integration: 3.5 hours

Darks: ~16

Flats: ~50

Bias: ~50

Avg. Moon age: 27.29 days

Avg. Moon phase: 5.57%

Bortle Dark-Sky Scale: 6.00

Temperature: 10.00

Astrometry.net job: 1786229

RA center: 25.747 degrees

DEC center: 13.642 degrees

Pixel scale: 3.203 arcsec/pixel

Orientation: 188.974 degrees

Field radius: 0.700 degrees

Data source: Backyard

Description

NGC 660 is a representative of the rare class of galaxies known as polar ring galaxies. Galaxies of this type are thought to be the result either of a perpendicular collision of two galaxies or of a close pass that tidally strips material from one, which then forms a ring around the other. The central portion of NGC 660 is a lenticular galaxy. As many as 5% of lenticulars might have polar rings at some point in their lifetimes.

NGC 660 was well positioned in my skies during this imaging session to provide me with the opportunity to acquire 3.5 hours of integration time. I was not sure that this would be sufficient time to allow me to pull its ring out of the background light pollution. I was pleasantly surprised to see how much of the ring I was able to resolve.

Comments

Author

georgemsimon
George Simon
License: None (All rights reserved)
940
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Revisions

  • Polar Ring Galaxy NGC 660, 





    
        

            George Simon
    Original
  • Polar Ring Galaxy NGC 660, 





    
        

            George Simon
    B
  • Polar Ring Galaxy NGC 660, 





    
        

            George Simon
    C
  • Final
    Polar Ring Galaxy NGC 660, 





    
        

            George Simon
    D

B

A couple of minor, cosmetic tweaks.

C

One more small, cosmetic change.

D

I used a different algorithm in Nebulosity (Colors in Motion) to stack the calibrated subs, and it produced a sharper image, with tighter stars.

Sky plot

Sky plot

Histogram

Polar Ring Galaxy NGC 660, 





    
        

            George Simon

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